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Top Forums Shell Programming and Scripting How to control grep output intact for each matching line? Post 303024541 by Corona688 on Wednesday 10th of October 2018 01:43:41 PM
Old 10-10-2018
Buffering will make a mess of this, bundling arbitrary blocks into one write. These arbitrary blocks don't care much where lines begin and end. Long enough lines could conceivably take more than one write!

If you have GNU awk, --line-buffered may help, but will have a big performance cost.

You could also send the output to separate files and cat them together later.
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ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
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